<template>
    <div class="goodsinfo-container">
        
        <!-- 购物车小球 -->
        <transition
        @before-enter="beforeEnter"
        @enter="enter"
        @after-enter="afterEnter">
            <div class="ball" v-show="ballFlag" ref="ball">

            </div>
        </transition>
        <!-- 商品轮播图区域 -->
        <div class="mui-card">
            <div class="mui-card-content">
                <div class="mui-card-content-inner">
                    <swiper :lunbotuList="lunbotu" :isfull="false"></swiper>
                </div>
            </div>
        </div>

        <!-- 商品购买区域 -->
        <div class="mui-card">
            <div class="mui-card-header">{{goodsinfo.title}}</div>
            <div class="mui-card-content">
                <div class="mui-card-content-inner">
                    <p class="price">
                        市场价：<del>￥{{goodsinfo.market_price}}</del>&nbsp;&nbsp;&nbsp;销售价：<span class="now_price">￥{{goodsinfo.sell_price}}</span>
                    </p>
                    <p>购买数量：<numbox @getcount = "getSelectedCount" 
                    :max="goodsinfo.stock_quantity"></numbox></p>
                    
                    <p>
                        <mt-button type="primary" size="small">立即购买</mt-button>
                        <mt-button type="danger" size="small" @click="addToShopCar">加入购物车</mt-button>
                    </p>
                </div>
            </div>
            
        </div>

        <!-- 商品参数区域 -->
        <div class="mui-card">
            <div class="mui-card-header">商品参数</div>
            <div class="mui-card-content">
                <div class="mui-card-content-inner">
                   <p>商品货号：{{goodsinfo.goods_no}}</p>
                   <p>库存情况：{{goodsinfo.stock_quantity}}件</p>
                   <p>上架时间：{{goodsinfo.add_time | dataFormat}}</p>
                </div>
            </div>
            <div class="mui-card-footer">
                <mt-button type="primary" size="large" plain @click="goDesc(id)">图片介绍</mt-button>
                <mt-button type="danger" size="large" plain @click="goComment(id)">商品评论</mt-button>
            </div>
        </div>
    </div>
</template>

<script>
    import swiper from '../subcomponents/swiper.vue'
    import numbox from '../subcomponents/goodsinfo_numbox.vue'
    
    export default {
        data() {
            return {
                id: this.$route.params.id,
                lunbotu: [],
                goodsinfo: {},
                ballFlag: false, //控制小球隐藏显示
                selectedCount: 1 //商品数量
            }
        },
        created() {
            this.getLunbotu();
            this.getGoodsInfo();
        },
        methods: {
            getLunbotu(){
                this.$http
                .get("api/getthumimages/" + this.id)
                .then(result => {
                    if(result.body.status === 0){
                        result.body.message.forEach(item => {
                            // 因为轮播图组件是遍历item.img而这里的message是src所以要改一下
                            item.img = item.src;
                        });
                        this.lunbotu = result.body.message;

                    }
                })
            },
            getGoodsInfo() {
                this.$http
                .get('api/goods/getinfo/'+this.id)
                .then(result => {
                    if(result.body.status === 0){
                        this.goodsinfo = result.body.message[0];

                    }
                })
            },
            goDesc(id) {
                // 编程式导航
                this.$router
                // id这里是id:id缩写了而已
                .push({name: 'goodsdesc',params: {id}})

            },
            goComment(id) {
                this.$router
                .push({name: 'goodscomment',params: {id}})
            },
            addToShopCar() {
                // 添加到购物车
                this.ballFlag = !this.ballFlag;
            },
            beforeEnter(el) {
                 el.style.transform = "translate(0, 0)";
            },
            enter(el,done) {
                el.offsetWidth;//这个很重要

                // 写死了的话滚动或者换了分辨率不能灵活跳到购物车，坐标  应该写成动态的
                // 如何 获取 徽标和小球的 位置？？？   domObject.getBoundingClientRect()得到最顶部和最左部
                // domObject是指对象可通过(this.$ref.定义的名称来获取当前组件的元素)
                const ballPosition = this.$refs.ball.getBoundingClientRect();
                // 这里的话badge是来自app.vue组件的,$ref不能够拿到他，通过父子传值也不方便
                // 所以vue也可以适当用些dom操作
                const badgePosition = document.
                getElementById("badge").
                getBoundingClientRect();

                const xDist = badgePosition.left - ballPosition.left;
                const yDist = badgePosition.top - ballPosition.top;
                // console.log(xDist+'-------'+yDist);
                // 采用es6``实现字符串拼接
                el.style.transform = `translate(${xDist}px,${yDist}px)`;
                // 把ease改了
                el.style.transition = 'all 0.5s cubic-bezier(.4,-0.3,1,.68)';
                done();
            },
            afterEnter(el) {
                this.ballFlag = !this.ballFlag;
            },
            getSelectedCount(count) {
                this.selectedCount = count;
                console.log("父组件拿到子组件的值啦"+this.selectedCount)
            }
        },
        components: {
            swiper ,
            numbox
        }
    }

</script>

<style lang="scss" scoped>
    .goodsinfo-container {
        background: #eee;
        overflow: hidden;
    }
    .now_price {
        color: red;
        font-size: 16px;
        font-weight: bold;
    }
    .mui-card-footer {
        display: block;
        button {
            margin: 15px 0;
        }
    }
    .ball {
        width: 15px;
        height: 15px;
        border-radius: 50%;
        background-color: red;
        position: absolute;
        z-index: 99;
        top: 390px;
        left: 146px;
    }
</style>